From: Eric Anholt eric@anholt.net
[ Upstream commit a242f4297cfe3f4589a7620dcd42cc503607fc6b ]
db820c wants to use the qcom smmu path to get HUPCF set (which keeps the GPU from wedging and then sometimes wedging the kernel after a page fault), but it doesn't have separate pagetables support yet in drm/msm so we can't go all the way to the TTBR1 path.
Signed-off-by: Eric Anholt eric@anholt.net Reviewed-by: Bjorn Andersson bjorn.andersson@linaro.org Link: https://lore.kernel.org/r/20210326231303.3071950-1-eric@anholt.net Signed-off-by: Will Deacon will@kernel.org Signed-off-by: Sasha Levin sashal@kernel.org --- drivers/iommu/arm/arm-smmu/arm-smmu-qcom.c | 13 ++++++++++++- 1 file changed, 12 insertions(+), 1 deletion(-)
diff --git a/drivers/iommu/arm/arm-smmu/arm-smmu-qcom.c b/drivers/iommu/arm/arm-smmu/arm-smmu-qcom.c index 98b3a1c2a181..44a427833385 100644 --- a/drivers/iommu/arm/arm-smmu/arm-smmu-qcom.c +++ b/drivers/iommu/arm/arm-smmu/arm-smmu-qcom.c @@ -130,6 +130,16 @@ static int qcom_adreno_smmu_alloc_context_bank(struct arm_smmu_domain *smmu_doma return __arm_smmu_alloc_bitmap(smmu->context_map, start, count); }
+static bool qcom_adreno_can_do_ttbr1(struct arm_smmu_device *smmu) +{ + const struct device_node *np = smmu->dev->of_node; + + if (of_device_is_compatible(np, "qcom,msm8996-smmu-v2")) + return false; + + return true; +} + static int qcom_adreno_smmu_init_context(struct arm_smmu_domain *smmu_domain, struct io_pgtable_cfg *pgtbl_cfg, struct device *dev) { @@ -144,7 +154,8 @@ static int qcom_adreno_smmu_init_context(struct arm_smmu_domain *smmu_domain, * be AARCH64 stage 1 but double check because the arm-smmu code assumes * that is the case when the TTBR1 quirk is enabled */ - if ((smmu_domain->stage == ARM_SMMU_DOMAIN_S1) && + if (qcom_adreno_can_do_ttbr1(smmu_domain->smmu) && + (smmu_domain->stage == ARM_SMMU_DOMAIN_S1) && (smmu_domain->cfg.fmt == ARM_SMMU_CTX_FMT_AARCH64)) pgtbl_cfg->quirks |= IO_PGTABLE_QUIRK_ARM_TTBR1;